Hust take a look at what the job postings are asking for. Nearly all I've seen want experience in R, SAS. You can run python in R by installing an interpreter and run SQL queries with the function sqldf(). There are a ton of free resources to learn R and several youtube channels dedicated to it. This book will get you started without having to take a formal class: https://www.amazon.com/gp/product/B01NAJAEN5/ref=ppx_yo_dt_b_d_asin_title_o00?ie=UTF8&psc=1
Hadley Wickham actually does lots of data analysis, got his Ph.D in statistics, taught statistics, popularized "tidy data" and "split apply combine", actively contributes to his packages, and stays in touch with the community. It's not a coincidence that his new book is one of the highest rated data science books of all time with 85% 5 star reviews.
R for Data Science - to learn how to manipulate data.
An Introduction to Statistical Learning - for an introduction to statistics and machine learning.
Deep Learning with R - for an introduction to deep learning.